KAGRA SCIENTIFIC CONGRESS: COLLABORATORS’ INFORMATION EXCHANGE

2019/12/01

KSC Newsletter
Issue 6KAGRA joined International GW Network
Signed up LIGO-Virgo-KAGRA MoA for joint observation
On October 4, 2019, KAGRA held a ceremony to mark the completion of the detector. The ceremony was in thesite, and after the play of the music of kagura (the traditional Shinto-style ritual music) by local children’s
musical group, Takaaki Kajita, our PI, pushed a button with U Tokyo Executive Vice President Kohei Miyazono
to demonstrate the detector in motion. In the evening of the day, the signing ceremony of a memorandum ofagreement (MoA) on a research collaboration between KAGRA, LIGO and Virgo were held.
This MoA makes KAGRA an equal partner of LIGO and Virgo, and once KAGRA satisfied the criteria for joining
observation then all the scientific achievements will be presented as LIGO-Virgo-KAGRA collaboration. KAGRA
is definitely close to the production phase after the ten-year construction and installation period. 🍏(Above) Pose for photos after signing a MoA. (from left) EGO vicepresident Christian Olivetto, Virgo spokesperson Jo van den Brand,
KAGRA principal investigator Takaaki Kajita, LIGO Executive Director
David Reitze, KSC board chair Hisaaki Shinkai, and KAGRA vice PI
Masatake Ohashi. At ANA Crowne Plaza hotel Toyama, October 4,
2019. [Photo courtesy of Hida City](Right above) The ceremony at the site. Playing kagura music by local
shrine musicians. (Right below) Takaaki Kajita and U Tokyo Vice
President Kohei Miyazono switched on the green button, and it locked.
[Photos courtesy of H. Oobayashi.]1

KAGRA Scientific Congress Newsletter No. 6

Directions

2019/12/01

LVK-MoA and Our required actions

LVK-MoA and its background we should understandThe signed MoA consists from three parts: the main part [JGW-M1910663], Attachment A [JGW-M1910664],
and Letter of Intent (LoI) for KAGRA to join the O3 run [JGW-M1910813].
The main part (10 pages) describes the concept of the collaboration, the definitions of terms, and the
explanations of purposes. The Attachment A (17 pages) rules how we organize the collaboration with moredetailed procedures. These two are completely equivalent with the MoA between LIGO and Virgo (LV) which
was signed up in March 2020. During the round table discussion between LV and K at the LV collaboration
meeting in Warsaw in September, we actually heard an opinion that integrating KAGRA as an equal-level
partner is a little bit early. It is true that KAGRA is just newly constructed detector, and the KAGRA members do
not have any experience of the real observation and real data analysis of detections. However, LV welcomed us
and proceeded to form the collaboration together for promoting science. We therefore have an obligation tomeet expectations. That is, we have to catch up with their detectors’ sensitivity as soon as possible, and wehave to participate and lead the science discussions as much as possible. KAGRA members are expected to join
the weekly telecons, participate in LVK meetings, contribute as paper-writing teams, and plan our future
together.
The third part LoI (3 pages) is of the conditions to KAGRA for participating current ongoing Observation-3 run.
In order to declare the joint LVK observation, we have to pass the checklist of the data flows, and to pass theminimum sensitivity at a certain level. Once approved, then we can co-author to the observational results. Until
KAGRA produces the data, the authorship to joint observation papers will be in the pending status and the same
rule as LV members will be applied; that is, the authorship will be approved after one year contribution fromthe sign-up date (in our case, October 1, 2020). We regarded that these are reasonable requirements, andstarted LVK network of gravitational wave science.
Some statistics of the LVK collaboration are shown below:

Our required actions to LVK-MoA
After signed the MoA, KAGRA should observe the LVK policies. Among then, here we comment the following
issues.
First of all, all the results and discussions in the collaboration are confidential until information is disclosed.
From November, for example, “Observational Science Highlight” is circulated by email 1, which includes

1 https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10997

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confidential ongoing analysis. Do not leak. Do not comment in a meeting, do not talk to a non-collaborator, do
not tweet. This rule is also applied when you deal with data.
In the Attachment A, the concept of “Observational Result” forms the central idea of publication andpresentation. “Observational Result” is defined as any first statement of an astrophysical, cosmological, or
fundamental physics nature derived from LIGO, GEO, VIRGO, or KAGRA gravitational wave data. Regarding such
"Observational Result”, LVK policy prioritizes our own publication policy. (At the coming face-to-face meeting at
RESCEU in December, we plan to amend our publication policy as such.)
We signed MoA in October, when O3a period was over. However, since we discuss in our telecons2 both O3aand O3b data simultaneously, the short author-list publication rules will also applied to us even for O3a data.
That is, we need to report our progress regularly to the working group telecons, and get the approval of LVK
collaboration before submitting short author-list paper if we use results in public domain.
We also assign dozen persons to LVK joint committees. Many of us should participate LVK collaboration meeting(twice a year) from the next one. We will host LVK collaboration meeting at somewhere in near future…
Please understand that we are in the transient phase, and let’s make it together. Hisaaki Shinkai 🍏Collaboration

New KSC board started

At the face-to-face meeting in Toyama, August, the ballots of the new KSC board was opened, and five

KSC board

from August 2019 to August 2020.

Hisaaki Shinkai (OIT, chair)
Shinji Miyoki (ICRR, vice chair)
Chunglee Kim (Ewha Womans U, vice-vice chair)
Hideyuki Tagoshi (ICRR)
Tomotada Akutsu (NAOJ)

Zhoujian Cao (BNU, China region)
Hyung-Won Lee (Inje U, Korea region)
Ray-Kuang Lee (NTHU, Taiwan region)
Hirotaka Yuzurihara (ICRR, post-doc)
Tomohiro Yamada (ICRR, student)

members were decided. Among them, Hisaaki Shinkai accepted to take the chair, Shinji Miyoki works as vicechair, and Chunglee Kim as vice-vice chair. Including regional representatives, post-doc & student
representatives, ten members started the new KSC board.
KSC board assigned the new committee of publication control (CPC), which is now belong to KSC, andNorikatsu Mio takes the chair for the next year. A couple of rules are determined: Term of CPC committee is
two years, and half members will be changed every August.
From October, new author-list committee is assigned. Kentaro Somiya accepted to work as the chair for the
next year. In October, according to the LVK-MoA, KSC board assigned LVK joint committee members as KAGRA
co-chairs. Please refer the KSC organization chart in the next page. This chart is maintained in our wiki. 3
The KSC board recently has tried to improve the accessibility of wiki pages.4 Our wiki now has FAQ (Frequently
Asked Questions) page5, Your Action Required page 6, O3a/O3b information page 7, etc. If you are interested inblushing up the design of them, you are really welcome.

2 I guess many of you began attending weekly telecons with LV on each particular research subjects.

3 http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC#Organization
4 http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/
5 http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/FAQ
6 http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/YourActionRequired
7 http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/O3b3

KAGRA Scientific Congress Newsletter No. 6

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KSC organization chart (as of November 2019)
KAGRA Scientific Congress (KSC)
organization chart
2019/November 22

PI
EOsharing information & idea

SEO

* Hisaaki Shinkai* Shinji Miyoki* Chunglee Kim
Hideyuki Tagoshi
Tomotada Akutsu

KSC board

Data Analysis
Committee (DAC)

Compact
BinaryCoalescence* Hideyuki Tagoshi
Kipp Cannon
Hyung-Won Lee
Tjonnie Li

Continuous
Wave

Burst Wave

* Yousuke Itoh

* Kazuhiro Hayama

Future Planning
Committee (FPC)*Sadakazu Haino
Chunglee Kim
Kentaro Komori
Matteo Leonardi

Atsushi Nishizawa
Yuta Michimura+ Kentaro Somiya(chair of PRDC)

sec 2.5

sec 3.1
Joint Run Planning Committee
sec 3.2
Detector Characterization andData Quality Committee

Stochastic
Wave

Computing& Software* Guo-Chin Liu* Ken-ichi Oohara
Sachiko Kuroyanagi Hirotaka Takahashi
Kazuki Sakai

Project R&D
Committee (PRDC)*Kentaro Somiya
Yosuke Itoh
Shinji Miyoki+ Sadakazu Haino (chair of FPC)

Shinji Miyoki
Yousuke Itoh
Keiko Kokeyama
Takahiro Yamamoto

Calibration

Detchar* Yuki Inoue* Keiko Kokeyama
Takahiro Yamamoto

Collaborator-list
Manager* Hideyuki Tagoshi
Sachiko Kuroyanagi
Akiko Sakai (secretary)
Naomi Kudo (secretary)sec 3.4
Joint Computing and Software
Committee
sec 3.5
Joint Editorial board

Collaboration

Ken-ichi Oohara
Nobuyuki Kanda* Norikatsu Mio
Masashi Ohkawa
Yuichiro Sekiguchi
Zong-Hong Zhu
Hyung-Won Lee
Yuta Michimura

Diversity
Committee* Keiko Kokeyama
Joseph M Fedrow
Chunglee Kim
Kazuki Sakai
Hisaaki Shinkai
Hirotaka YuzuriharaInternational
Cooperation WG

sec 3.7
Joint Detection Committee

Nobuyuki Kanda

LIGO Identity and Access
Management team

Hirotaka Takahashi

Yuki Inoue

Committee of
Publication Control

Hisaaki Shinkai
Ray-Kuang Lee

sec 3.3
Calibration Committee

Author-list
Committee* Kentaro Somiya
Yoichi Aso
Kazuhiro Hayama
John J. Oh
Albert Kong
Atsushi Nishizawa* Hideyuki Tagoshi+ WGs chairs/vice chairs+ Hisaaki Shinkai (board)sec 3.6
Joint Meeting Committee

Joint Review Committee

Zhoujian Cao (China)
Hyung-Won Lee (Korea)
Ray-Kuang Lee (Taiwan)
Hirotaka Yuzurihara (PD)Tomohiro Yamada (Student)

Tadayuki Tomaru
Nobuyuki Kanda
Hisaaki Shinkai
Hyung-Won Lee
Zhong-Hong Zhu
Feng-Li Lin
Helios Vocca

LVC-KAGRA taskforce
Yoshio Saito (KAGRA - leader, project manager)
Hideyuki Tagoshi (KAGRA - Data analysis)
Takahiro Yamamoto (KAGRA - Calibration)
Osamu Miyakawa (KAGRA - commissioning)
Hisaaki Shinkai (KAGRA - MoU)
Sadakazu Haino (KAGRA data analysis)

Steve Fairhurst (LSC)
Patricia Schmidt (LSC)
Leo Singer (LSC)
Marie Anne Bizouard (Virgo)
Helios Vocca (Virgo)

New EO members, SEO set Run Coordinator

Related to the organization, we also introduce thenew executive office (EO), and the systemengineering office (SEO). From August 2019, EO
invited three regional representatives and data
analysis committee chair as members. The
committee members are: Takaaki Kajita (chair,
ICRR), Masaki Ando (UT), Masatake Ohashi (ICRR),
Yoshio Saito (ICRR), Nobuyuki Kanda (OCU),
Takayuki Tomaru (NAOJ), Yoshiki Moriwaki (U.
Toyama), Hisaaki Shinkai (OIT, KSC chair), Helios
Vocca (Perugia, Italy), Jaewan Kim (Myongji Univ.
Korea), Zong-Hong Zhu (Beijing Normal Univ.,
China), Sadakazu Haino (Academia Sinica, Taiwan),and Hideyuki Tagoshi (DAC chair, ICRR).

SEO newly assigned the Run Coordinator who
coordinates tasks of both the detector and data
analysis before and during the ERs and O3. The listof SEO is as follows:
Yoshio Saito
Project manager
Masatake Ohashi
Director, also as
Deputy Project Manager
Shinji Miyoki
Run coordinator
Osamu Miyakawa
Commissioning team leader
Takashi Uchiyama
Scheduler
Yoichi Aso
management of VIS/MIF/AOS
Toshikazu Suzuki
management of CRYO tasks
Masaki Ando
design of roadmap
Kentaro Somiya
auditing of budget/schedule

The KSC organization chart is maintained at [KSC wiki], while the organization chart of KAGRA is maintained
at [JGW-M1706715].

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KAGRA Scientific Congress Newsletter No. 6

Detector

2019/12/01

Count down for the start of joint observation

While we had the ceremony of construct completion in October,
KAGRA is now rushing to start observation. Since we announced
that we will start observation by the end of 2019, and we alsoannounced that our target in O3 is over 10 Mpc in binary
neutron-star range, four orders of sensitivity improvement fromthat of the first locking in August is necessary. Detector teams areseriously working together in commissioning and noise-huntings.
The latest klog shows that the sensitivity curve is gradually
improved. We see regularly the locking status more than a coupleof hours. Three-more digits. Do not worry.
We will try 24-hour engineering run for 7 days from December
17. After noise huntings, we hope that the real observation
starts soon.

(Above) Comparison of sensitivity curves.
Courtesy: Yuta Michimura.
(Left)
Noise hunting memo. Courtesy:
Takaaki Yokozawa & PEM team.
Both are from Yousuke Itoh’s viewgraph in
JGRG29, November.

Operator shift & Collaborator shift from December 17
Once our observation starts, then all collaborators are supposed to cooperate as shift takers, either as an
operator shift (who is responsible for operation of the detector) or a collaborator shift (who is not). The tasks ofthe latter is to monitor the system, to log the status, and to make emergency call if something happens (maybe
more other tasks).
As is shown in [JGW-M1809380], all shifts are
Shift
Assignedformulated with 3 times a day, pairing two for
RegionContact Person
CandidateWeekseach, 7 days period starting every Tuesday.
Japan

142

82

Osamu Miyakawa

Taiwan27

16

Guo-Chin Liu

China

26

16

Zong-Hong Zhu

Korea

21

12

Hyung-Won Lee

Italy

11

6

Helios Vocca

Hong Kong

3

2

Tjonnie Li

USA

1

1

Lan Nguyen Quynh

5

Detector team is now calling to fill in thecalendar with first-comer base. When we calledshift candidates in April, more than 260 names
were collected. However, since the period is set
to 7 days, some of you will miss this chance. For
more details, please contact tokagra-shift@icrr.u-tokyo.ac.jp
or the person in the table.

KAGRA Scientific Congress Newsletter No. 6
Welcome2019/12/01

Brief Guide to Mozumi, KAGRA office

For those who are beginners of the KAGRA site (especially for shift participants), the wiki page information 8
and shift guide [JGW-M1809380] is useful. This article tries to help complementary to such official guide.
When I first visit the site, I remember it was full of unknowns.
First of all, KAGRA office is located in HigashiMozumi village, 38.5 km south from JR Toyama
station, one-hour driving distance. No shops aroundnearby. Preparing your own food and drinks isnecessary. If snow, then it’ll be one-meter depth
easily. So prepare your snow shoes.
The best way to the KAGRA office is to use Express
Bus for Hirayu-Onsen (Spa) from Toyama station at
BusStop 2. You can buy a bus ticket at the office,saying “For Mozumi by express bus”, 1390 JPY, or
post-pay by cash in the bus. Bus takes you 64
minutes to Mozumi.

The express bus runs only a coupleof times a day. So you should checkout the time table in advance.
Left map is a local one from the bus
stop of Mozumi to the KAGRA office.
It’s 5 minute distance. Nothing
there, you won’t miss it. You canmeet with wild bear 🐻 by luck.
Another side of the river, you willfind abandoned railway. Kamiokaline was operated between JR
Inotani and Okuhida-Onsenguchi(20km) until December 2006.

8

http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA#access

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Site people call the accommodation “Locomotion”. It’s the name of the apartment, 20 minutes driving distanceheading back to Toyama from Mozumi. KAGRA rents a couple of rooms, and we use each room by sharing witha couple of us. You need to bring your toothbrush, toothpaste, shampoo, towel, …. You can cook at the kitchen.
Coin laundry is at the parking. In walking distance, there are a couple of restaurants, supermarket, and a
Seven-Eleven store. Takayuki Tomaru recommended Yakitori restaurant, Akiyoshi 秋吉，which is at the next to
the Locomotion. It is good with reasonable price. Five-minute walk to south, you will find a good sushi
restaurant, Ban-ya-no-sushi 番やのすし. Five-minute walk to north (for Toyama station), McDonald is open
until midnight.
The Locomotion is in front of the bus stop,
Kami-Futasugi 上二杉. Only local bus (runsevery 30 minutes) stops.
The way to Mozumi (KAGRA office) from KamiFutasugi is a little bit tricky. You need totransfer the bus at Sasazu (or Inotani), from thelocal bus to the express bus. No local people
around at the bus stop. Only us.
The right figure is from the official guide [JGWM1809380]. Consult this document with bus
time table. Good luck to your arrival.
In summer time, you can access easily to theJapan North Alps. Toyama station is the starting
point of the Kurobe-Tateyama Alpine Route.
With train, cable car, and bus, you can reach
Murodo 室堂 (2450m), the entrance to Mt.
Tateyama 立山 (3015m)．With further trolleybus, ropeway, and cable car, you will arrive at Kurobe
Dam, one of the biggest dam in Japan, completed in1963.
By 20 minutes drive to southfrom Mozumi, at Kamioka Lab in
the Kamioka road station, you
can purchase a jigsaw puzzle ofSuper-Kamiokande.
Hida-Furukawa town is famous
for a couple of real-life locationsof the movie, “Your Name”.
Enjoy your stay. 🍏

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Public Relations

Mass of media propagate
KAGRA’s completion
KAGRA's completion ceremony and MoA signingceremony on October 4th, 2019 were opened tomass media. In addition, KAGRA's experimental
hall and arm tunnel were previewed by media on
September 30th and media briefing was held
between the completion and signing ceremonies.
The news that KAGRA is completed and joins
world's network attracted reporters' attention andall the events were attended by more than 40
media people. These media events resulted a lotof news articles spanning from local newspapers
to Japan-wide networks. Now, KAGRA's
completion is really well-known to the people anda lot of science supporters are awaiting its
observation start!

Café KAGRA returns
Following the last year's event (see KSC Newsletter #3), Café KAGRA returned on October 5th at Kamioka
library in Kamioka downtown. This time, while the café master was switched to Mr. Yuichi Takayanagi, thedirector of Tamarokuto Science Museum, he moderated relaxing conversations among the guests. Since all theguests were the members of KAGRA's naming committee, naturally the topic turned into about the name of
KAGRA. Takayanagi said "The name
`KAGRA' is lovely. We can easily
understand it is an instrument in
Kamioka and it observes gravitational
waves. Moreover, the name KAGRA
contrasts with other telescopes end with
IGO." The audience enjoyed a fantastic
hour of an autumn day in Kamioka.

Science Café in Gifu City
Gifu Shimbun newspaper company holds a series of Science
Café in the headquarters of the company. On November 9th,
Dr. Takafumi Ushiba, ICRR's project assistant professor gave atalk entitled "Gravitational Wave Telescope KAGRA starts
observation - a new challenge from Kamioka -" in the sciencecafé. The audience, spans from junior high-school students tosenior science fans, listened to the talk with deep interest.
After the talk, a lot of questions including highly technicalones were asked from the audience. The Q&A session
continued until the closing time of the building.
Yoshihisa Obayashi 🍏

8KAGRA Scientific Congress Newsletter No. 6

Previous F2F

2019/12/01

Face-to-Face 23 at Univ. Toyama, August 22-24

Program: http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/Meeting/f2f/2019August
We had a regular summer event at Toyama. The number of the participants was the largest ever, 140
collaborators. On the second day of F2F, the first lock of the detector was reported, and the group photo wastaken (below) with that sensitivity curve. Four digits more, but everyone looks sooo happy.
New KSC board members were selected, and the draft of MoA with LIGO/Virgo was approved to go negotiation.
Satellite meeting on future upgrade plan was held, where the chair Sadakazu Haino showed the draft of thewhite paper as a result of future planning committee. Before and after the F2F, thirty colleagues (with one
mother of a colleague) visited the KAGRA site. We enjoyed free dinner at the U Toyama cafeteria, with thesupport of Toyama City. We thank LOC, Moriwaki-san, Yamamoto-san and group of U Toyama, and also
especially to Takayama-san for hosting the meeting. 🍏

Next F2F

Face-to-Face 24 at RESCEU, December 4-5
Program: http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/Meeting/f2f/2019Dec

The group of Research center of the Early Universe (RESCEU) Univ Tokyo kindly hosts our next F2F. The December
meeting is for two days, and we expect many thesis presentations. We have received registrations of 111 colleagues.
This would be the final meeting before the real operation. We will discuss a couple of our policy revisions, shiftsystems, and so on. 🍏

KAGRA MEETING SCHEDULE
Mark your calendar now for the following meetings.
The 24th KAGRA Face-to-Face meeting at U. Tokyo, RESCEU, December 4-5, 2019.
LIGO-Virgo-KAGRA collaboration meeting at Lake Geneva, Wisconsin, USA, March 16-19, 2020.
The 25th KAGRA Face-to-Face meeting at ICRR U. Tokyo, April (16-18 or 23-25), 2020.
The 7th KAGRA International Workshop, at National Central U., Taoyuan, Taiwan, May 29-31, 2020

OTHER RELATED GW MEETINGS
Check out http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/O3b#MeetingInfo for KAGRA related
one or more generally https://wiki.ligo.org/LSC/UpcomingConferencesAndMeetings(Please check them before you plan to organize a meeting, in order to avoid schedule conflict.)9

KAGRA Scientific Congress Newsletter No. 6

Report2019/12/01

Probing Our Universe with Quantum Technologies
Yuta MichimuraThis year's Quantum Electronics workshop was held at Yamanaka Ryo Naito Seminar House,
University of Tokyo. Quantum Electronics workshop is an annual workshop organized by the
Quantum Electronics Group, which is one of the Professional Groups of the Japan Society of Applied
Physics. The theme of this year's workshop was pretty peculiar: Astro-quantum electronics. Recent advancementof quantum electronics have enabled very precise measurements in a variety of ways, and there's increasing
interest to use them for observing our universe. A quick example is of course laser interferometric gravitational
wave detection, and I gave a talk on the current status and quantum technologies to enhance the detector
sensitivity. We also invited speakers from variety of fields: cosmology, radio to gamma-ray astronomy, neutrino,
dark matter, optical lattice clocks and so on. The speakers focused more on the technologies rather than theirscience goals, and I enjoyed the workshop very much. I realized again that science is based on technology andthere's a plenty of room for collaboration with researchers in applied physics.
For details, visit 応⽤物理学会 量⼦エレクトロニクス研究会「宇宙量⼦エレクトロニクス」
https://annex.jsap.or.jp/qe/astro2019.html (only in Japanese…).

Report

Six topics in the Frontiers of Science symposium
Ayaka Shoda

Frontiers of Science Symposium, which is organized by JSPS, is the symposium to discuss
about the advanced topics over six different subject fields. I attended the UK-Japan FoS that is
carried out in cooperation with Royal Society in the UK. It was very impressive to know about the state-of-art
science. I realized the sci-fi world was coming. Also it was a good opportunity to know researchers in otherfields.
Followings are the topics we have discussed about.
• Earth science: Anthropocene (Effects of human on the earth environment)• Physics/Astronomy: Black holes (GWs and black hole image by EHT)
• Biology: Synthetic Biology (Creating artificial cells that can create protein or re-produce themselves)• Medical science: Computational brain modeling and brain-computer interfaces (Understanding of the brain
functions and combination of the brain and computer.)• Chemistry: Smart materials (Self-healing materials, such as concrete and ceramics)• Mathematics: Signal from Noise (Some technics for better understanding of the data, such as one using 3D
projection)
Frontiers of Science Symposium by JSPS

https://www.jsps.go.jp/english/e-fos/index.html

WE FOUND THAT …
English version of KAGRA's introduction movie is online!
Thank you international KAGRA fans for waiting. Enjoy!
https://gwcenter.icrr.u-tokyo.ac.jp/en/archives/1365

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KAGRA Scientific Congress Newsletter No. 6

2019/12/01

Poster Award Winners”Most Outstanding Presentation Prize” at the F2F
Toyama 2019

At the 23rd face-to-face meeting Toyama August 2019, we awarded Kiichi
Kaihotsu, Yukino Mori (U. Toyama) and Naoki Aritomi (ICRR) for their poster
presentations. Two received a certification signed by Kajita-san. H.Shinkai donated
his new book draft as the winner's prize.) Here are the abstracts of the winner's
works.

Yukino Mori & Kiichi Kaihotsu (U. Toyama)
New noise search method by portable PEMs
We introduced the new portable PEMs (PhysicalEnvironmental Monitors) which are the combination of
the Chromebook and USB sensors (microphone, accelerometer, magnetometer, etc).
Portable PEMs are useful tools for investigating and hunting the environmental
noises. They have several features; we can measure the environmental noises very
easily and with any limitation, such as AC electric outlet, cabling, placement and soon. Also, they are light enough to carry in and out, and these useful softwares of thespectrogram were produced by the google app.
One example outcome of the noise
hunting using this tool is the 300Hz
acoustic noise which was found in thecenter area of the KAGRA. We could
identify the origin of the 300Hz acoustic
noise (See left photo); it turned out to be the fan filter unit (FFU)
placed in the PR2 clean booth entrance. When we turned off the
FFU, the 300Hz noise was decreased (See right figure). If you founda mysterious noise and felt “The signal never disappears!” or “I don’tknow from where the noise comes!”, you may find the origin of suchenvironmental noise by this portable PEMs!. 🍏

Naoki Aritomi (U. Tokyo)
Control of a Filter Cavity with Coherent Control Sidebands
The use of a detuned filter cavity
together with a frequency independent
squeezed light source is a very maturetechnique for the production of
frequency dependent squeezed state.
For accurate alignment and length
control of the filter cavity, we suggest a
new control scheme of the filter cavity
with coherent control sidebands which
are used to control squeezing angle. Since both coherent control sidebands andsqueezed vacuum are aligned to OPO, squeezed vacuum is automatically aligned to
the filter cavity with this scheme. We calculated the error signal of the filter cavity
with this scheme (figure) and showed that shot noise and PLL noise with thisscheme meet the requirement of residual RMS filter cavity length fluctuation. This
scheme will be tested with 300 m filter cavity in TAMA. 🍏

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KAGRA Scientific Congress Newsletter No. 6

Awarded2019/12/01

Poster Prize at TAUP2019 for Tomohiro Yamada

Tomohiro Yamada (D2 student, ICRR) was awarded Poster
Prize at the international conference Topics in Astroparticle
and Underground Physics (TAUP2019) at Toyama, September
9-13, 2019. The poster title was ”KAGRA Cryogenic
Suspension Control toward the Observation Run 3”.
Congratulations!
Tomohiro sent his contents to the editors:
Cryogenic mirror is one of the most advanced technique in
KAGRA, and will be adopted in future gravitational wave
detectors: Einstein Telescope and Cosmic Explorer. Practically,
however, cryogenic environment has some difficulties: 1)
material property is changed at low temperature, so weneeded to develop a cryogenic compatible suspension, 2) in order to cool down the mirror to 20 K, we need toconnect heat links to the suspension, which is already isolated from seismic vibration by room temperature partof Type-A suspension. In this poster, for above two issues, we showed some significant progresses andconsiderations: 1) we implemented damping filters for the cryogenic suspension, and residual RMS angler
fluctuation of the suspension satisfied the requirement for lock-acquisition phase, 2) according to ourestimation with practically measured data, vibration via heat links perhaps impairs the sensitivity in several
dozen Hertz, therefore, we developed a vibration isolation system for heat links to meet stringent displacement
noise requirement. For the next step, towards O3, we need to measure and calculate suspension control noise,furthermore, longitudinal DOF damping control should be considered carefully. We are currently working on
the suspension noise-budget to achieve better detector sensitivity in low frequency region. 🍏Awarded

Poster Prize at GWPAW2019
for Hirotaka Yuzurihara

Dr. Hirotaka Yuzurihara (posdoc, ICRR) received a poster award at the international conference Gravitational
Wave Physics and Astronomy Workshop (GWPAW2019) which was held at RESCEU Univ. Tokyo, October 14-17,
2019. Congratulations!
Hirotaka presented a poster, “A nonparametricmethod to assess significance in search forcompact binary coalescences with false
discovery rate”, which proposes a new method
to evaluate the significance of the gravitational
wave event with false discovery rate. He
demonstrated the proposed method to theresults of the analysis the first observing run(O1) data of advanced LIGO. Please see thepaper arXiv:1907.00379 for more detail.
(photo) Dr. Yuzurihara with the poster and theHappi as extra prize (Happi is the costume of
the Japanese festival). 🍏

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KAGRA Scientific Congress Newsletter No. 6

Elected2019/12/01

Jun’ichi Yokoyama was elected tothe president of AAPPS

Jun'ichi Yokoyama, a professor of RESCEU (Research Center of the Early
Universe) University of Tokyo, and who is hosting December face-to-facemeeting, has been elected as the president of AAPPS, Association of Asia PacificPhysical Societies (http://www.aapps.org/), at the council meeting held during
APPC14. His term starts from January 2020 for three years.
AAPPS conducts cooperative activities with other major physical societies in theworld, such as the Asia Europe Physics Summit (ASEPS) which is a joint meeting
between AAPPS and European Physical Society (EPS).
At the IBR meeting held in Toyama in August, he suggested to organize a joint
session between KAGRA and Virgo at the forthcoming ASEPS, which received
favorable attention. 🍏

Diversity

Keiko Kokeyama in Malaysia
Keiko Kokeyama (ICRR) presented a talk on Demographics
of KAGRA collaboration at a Women-in-Physics session of
the 14th Asia Pacific Physics Conference (APPC14)
November, separately with the status talk of KAGRA. Thisconference was held at Borneo Convention Centre in
Kuching, Borneo island, Malaysia. Remarkably, 65% ofphysics undergraduate students in Malaysia is female. 🍏

Photo courtesy of Junʼichi Yokoyama

RECENT KAGRA STATUS TALKS SEE [JGW-E1605649] FOR THE LIST.
meeting/conferences

speaker

JGWdoc

LV collaboration meeting, Warsaw, Poland

Sep. 2019

Hisaaki Shinkai[JGW-G1910677]

TAUP 2019, Toyama, Japan

Sep. 2019

Masatake Ohashi[JGW-G1910791]

JPS meeting, Yamagata, Japan

Sep. 2019

Shinji Miyoki[JGW-G1910803]

LIGO PAC

Oct. 2019

Yoichi Aso[JGW-G1910885]

GWPAW 2019, Tokyo, Japan

Oct. 2019

Shinji Miyoki[JGW-G1910884]

GWPAW 2019, Tokyo, Japan

Oct. 2019

Takaaki Kajita[JGW-G1910902]

4M COCOS, Fukuoka, Japan

Oct. 2019

Yuta Michimura[JGW-G1910888]

AACP 2019, Malaysia

Nov. 2019

Keiko Kokeyama[JGW-G1910947]

JGRG 29, Kobe, Japan

Nov. 2019Yousuke Itoh

[JGW-G1911017]

13

KAGRA Scientific Congress Newsletter No. 6

Awarded2019/12/01

Student Presentation Award of the PSJ, September

Two KAGRA young colleagues were awarded independently the Student Presentation Award of the PhysicalSociety of Japan in the annual meeting 2019 September.
https://www.jps.or.jp/activities/awards/gakusei/2019_student_presentation_award.php
Development of Frequency Dependent Squeezing for Gravitational Wave Detectors (2)Naoki Aritomi (U. Tokyo)
Sensitivity of future gravitational wave
detectors will be limited by quantum
noise. Especially, the sensitivity will belimited by shot noise at high frequency
and by radiation pressure noise at low
frequency. To reduce shot noise andradiation pressure noise at the sametime, it’s necessary to inject frequency
dependent squeezed vacuum to aninterferometer. The squeezed quadrature
rotates by 90 degree around 70 Hz
which is the bandwidth of gravitational
wave detectors. To realize it, we plan to inject 9 dB frequency independent squeezed vacuum to a 300 m longcavity which is one of TAMA’s arms. We succeeded in controlling squeezing angle and achieved 6 dB ofsqueezing above 20Hz. 🍏

Development of Phase-III TOBA (Torsion Bar Antenna) for Gravitational Wave
Observation (18)： Development of a highly sensitive angular sensor
Yuki Miyazaki (U. Tokyo)
TOBA (TOrsion Bar Antenna) is a gravity
gradiometer, one of whose aim is toobserve newtonian noise. In order thatthe sensitivity is limited by shot noise
above 0.1 Hz, TOBA requires a highly
sensitive angular sensor, "Gouy-phasecompensating wave front sensor." It issimilar to a conventional wave front
sensor but uses coupled two cavities,
called main and auxiliary cavity. The
auxiliary cavity compensates gouy-phasein the main cavity so that TEM00 and
TEM10 can be resonated simultaneously
and angular signal is amplified. We foundthat loss in the auxiliary cavity disturbs
the amplification, and designed feasible parameters which will bring enough amplification of angular signal. 🍏

14

KAGRA Scientific Congress Newsletter No. 6

Science

2019/12/01

Proposals of KAGRA as a dark matter detector

In order to explain rotation curves of galaxy, collisionof galaxy clusters, and consistency of cosmic
microwave background (CMB) observation, existenceof dark matter is a consistent, simplest and plausible
idea. However, the problem is, we have never caught
them. The current candidates of dark matter are
weakly interacting massive particles (WIMPs),
primordial black holes (PBHs), and axions(hypothetical particle to resolve CP problem). Many
direct/indirect searches have been tried, but we could
have only got the prohibit region in its mass range.

Recently, two groups in the KAGRA collaborators
independently proposed a way to find dark matter
using interferometric GW detectors. Nagano et al [1]take a model of axion, which makes modulation ofphase velocity for the circular polarized photon. They
propose to use the arm cavities of interferometric GW
detectors to monitor the polarization. These FabryPerot cavities can be a detector for axion-like dark
matters without any degradation of the sensitivity to
GW observation.
Tsuchida et al [2] take a model of WIMPs, andshowed how much the motions of a pendulum andmirror in a GW detector will become excited due tothe collisions of WIMPs to the mirrors. They discuss
how such motions are detectable with sensors of GW
interferometers.
Both ideas conclude that we will obtain more strict
allowed regions ever in dark matter mass.
[1] K. Nagano, T. Fujita, Y. Michimura, & I. Obata, Phys.
Rev. Lett. 123 (2019) 111301. (arXiv:1903.02017)
Axion Dark Matter Search with Interferometric Gravitational
Wave Detectors[2] S. Tsuchida, N. Kanda, Y. Itoh, & M. Mori, arXiv:
1909.00654
Dark Matter Signals on a Laser Interferometer“Dark Matter”, a sort of massive chocolate(MACHO) was once sold in Japan, but it’s hardto observe it now.

FOR LATEX LOVERSKAGRA subscribes an online LaTeX editor, Overleaf (SharedLaTeX), with Professional level.

https://www.overleaf.com/
Personal use of Overleaf is free of charge, so please open your account (email address) by yourself.
This subscription enables us to edit, share and compile tex files online.
If you plan to use Overleaf for your projects, please contact to kagra-overleaf_at_icrr.u-tokyo.ac.jp
The manager will create a project and you can share files with your colleagues.
You need to inform the following data for creating a project- - - >>>
Project Name: xxxxx (e.g. TestGR_Ringdown2019 )purpose: (brief description, one line)
target journal: xxxx (CQG, PRD, PTEP ) —> default author-list tex will be provided upon request
editors: Name (email address), Name (email address), Name (email address), ….

- - - <<<
Please note that editors of each project can be added only by the managers. If a project is opened byabove request and your email is registered as an editor, then you can access to the related projects withyour account. (So that if you are already an Overleaf user, then your can continue to use your account.)
Please understand that this announcement is for preparing articles between us.

15

KAGRA Scientific Congress Newsletter No. 6

Newly Joined

2019/12/01

Masafumi Kurachi, research administrator of ICRR Kamioka

Hello everyone, I am Masafumi Kurachi, a newly hired research administrator working for Kamioka
experimental site. You might wonder what the "research administrator" is. My understanding is that it is aperson who plays the role of bridging researchers and the administration.
As you might know, ICRR had been designated as one of Joint Usage/Research Centers under the MEXT
program, and it was recently promoted to the INTERNATIONAL Joint Usage/Research Center. For the purposeof making this international project successful, ICRR decided to hire two research administrators, one at
Kashiwa campus and the other at Kamioka area. I myself was a researcher at that time, but was starting to think
about what kind of jobs I could take other than doing physics. When I found the job openings of this researchadministrator positions, I thought this might be one of very few jobs that I could make the most use of myability and experience. So I applied for the position. Why did I choose Kamioka rather than Kashiwa? Actually, I
didn't choose it. I applied for both positions to maximize the possibility of getting a job, but, in my mind, I was
hoping that they would offer a position at Kashiwa so that I can commute from Tokyo, in which I was livingwith my wife and my daughter. Fortunately, I was invited to the interview, but at that point, I was not told
which position I was a candidate for yet. Even after the interview started, I was still not sure for which position
they were considering me. Then finally, in the middle of the interview, when Kajita-san asked me his firstquestion, it became obvious. The question was, "Do you have a driver's license?" -- Soon after the interview, I
got an offer of the position... at Kamioka, of course.
Now it's been about eight months since I moved to
Kamioka. I am enjoying working here VERY MUCH.
What makes me comfortable is that, here at
Kamioka, I can feel that I am really involved in theexperimental activities rather direct way. The factthat I can contribute to the KAGRA project is
exciting. As a theorist, of course, I never doubted theexistence of gravitational waves, however, I never
expected that this "gravitational wave age" comes soearly. Nowadays, I am interested in the possibility
that topologically non-trivial configurations (of Higgs
field, for example) played an important role for thehistory of the early Universe, say, at the age of theelectroweak phase transition. For the study of the
dynamical picture in such an early period of the
Universe, the gravitational wave is the only
messenger that gives us the information. I am reallyproud of being, in some sense, a member of thefamily of the world-wide network of gravitational
wave observation, that has a potential to reveal themystery of our Universe.

Masafumi Kurachi with Takaaki Kajita & Michiko Kajita

Coming back to my role for KAGRA at the practical level, I consider myself as a person who will support foreign
researchers coming to KAGRA so that they can concentrate on research activities without worrying about otherthings. Those include variety of things, from administrative procedures to anything related to daily life inJapan. If you have any difficulty relating to coming to Japan or staying at Kamioka, I am the person who you
should talk to first, especially when you don't even know who is the right person you are supposed to talk to. I
will always be here at Kamioka for you.🍏

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KAGRA Scientific Congress Newsletter No. 6

2019/12/01

WE HEAR THAT …
Jun’ichi Yokoyama (RESCEU) becomes the president of Association of Asia Pacific Physical Societies,
January 2020. (see p13)
Tomohiro Yamada (ICRR) was awarded the Poster Prize at the international conference Topics in
Astroparticle and Underground Physics (TAUP2019), September 2019. (see p12)
Naoki Aritomi (U. Tokyo) was awarded the Student Presentation Award of the Physical Society of Japanin the annual meeting 2019 September. (see p14).
Yuki Miyazaki (U. Tokyo) was awarded the Student Presentation Award of the Physical Society of Japanin the annual meeting 2019 September. (see p14).
Hirotaka Yuzurihara (ICRR) was awarded the Poster Prize at the international conference Gravitational
Wave Physics and Astronomy Workshop (GWPAW2019), October 2019. (see p12)
Mei Takeda (Niigata U) was awarded Presentation Award Golden Prize in JGRG29, 2019 November.
Congratulations! If you have other news, please notice them to the editors.

KAGRA COLLABORATION ARTICLESAn arm length stabilization system with vertex injection of auxiliary lasers: a new scheme scalable to longerbaseline gravitational wave detectors
T. Akutsu et al. (KAGRA Collaboration, author-list 2018), submitted to CQG[arXiv:1910.00955] https://arxiv.org/abs/1910.00955

ARTICLE ON KAGRA
Scientific American November 2019>>>>

WE FOUND THAT …
KAGRA's photo by Enrico Sacchetti
Italy-UK based photographer Enrico Sacchtti visited KAGRA in August 2019 and created photographies.
KAGRA collaborator can use these photographies in their presentation, web/printed article etc after the
publishment of an article on Scientific American on Nov. 1, 2019. Please display credit "(c) Enrico
Sacchetti" when you use. If you want to give any of these to a person outside the KAGRA collaboration,
consult kagra-pub@icrr.u-tokyo.ac.jp beforehand. Checkout [JGW-G1910918].
Hisaaki Shinkai co-translated “Problem Book in Relativity and Gravitation” by A. P.
Lightman, W. H. Press, R. H. Price, and S. A. Teukolsky (1975) into Japanese. The
Japanese title is “Enshuu Soutaisei-riron, Jyuryoku-riron” (Morikita Pub.).
Translators, Hisaaki Shinkai and Takashi Torii, changed layout of the book, and wrote
appendices for recent development of the GR researches 50+ pages.
Many errors were corrected, and the whole contents were LaTeXed.
The price was unexpectedly high, but the publisher reduced the price from their initialplan.
https://note.com/morikita/n/nb992df196283
556 page, 850g. ISBN 978-4627156418, 12,000 JPY + tax.
published Nov 29, 2019. must buy.

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KAGRA Scientific Congress Newsletter No. 6

2019/12/01
National Tsing Hua University
Dung-Sheng Tsai (Postdoc)
Yao-Chin Huang (Postdoc)
Bo-Han Lin (Grad. Student)
Osaka City University
Hideki Ishihara (Prof.)
Ulsan National Institute of Science and Technology(UNIST)
Seungwoo Ha (Research Assistant)
Wuhan Institute of Physics and Mathematics(WIPM), Chinese Academy of Sciences
Yu-rong Liang (Associate Prof.)
Wei Zhao (Grad. Student)
August 1—November 30, 2019

New Collaborators
Korea Astronomy and Space Science Institute (KASI)
Jeong-Yeol Han (Principal Researcher)Sungho Lee (Senior Researcher)
Yunjong Kim (Researcher)Hyeon-Cheol Seong (Researcher)
Chang-Hee Kim (Postdoc)
Kyoto University, Yukawa Institute for Theoretical Physics(YITP)
Shinji Mukohyama (Prof.)
National Astronomical Observatory of Japan (NAOJ)
Tomoya Takiwaki (Assistant Prof.)

Collaboration-list committee made their mailing address kagraros@icrr.u-tokyo.ac.jp; ros from a roster.
If your affiliation address (or email) changes: Contact to kagraros@icrr.u-tokyo.ac.jp
If your group has new members: Contact to kagraros@icrr.u-tokyo.ac.jp
If you have a nice photo: Let the KSC Newsletter share them.
If your neighbor is planning to join KAGRA collaboration: Please suggest to check out our wiki FAQ
http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/FAQ

FROM EDITORS
We appreciate many contributors again for this issue.
We are always calling editorial volunteers, and we also want your posts and/or leaks of information.
We finally welcome one new editorial volunteer, Lan.
Please send your inquiries the current editorial staff.
Hisaaki Shinkai (OIT) hisaaki.shinkai at oit.ac.jp
Ayaka Shoda (NAOJ) ayaka.shoda at nao.ac.jp
Yoshihisa Obayashi (ICRR) ooba at icrr.u-tokyo.ac.jp
Kentaro Komori (MIT) kentarok_at_mit.edu
Quynh Lan Nguyen (UND) lnguyen3_at_nd.edu
Our dream is still to get the top download counts in JGWdoc.

KSC Newsletter backnumbers
this issue[JGW-L1911020]
https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=11020
No. 5 (2019/8)[JGW-L1910543]https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10543
No. 4 (2019/4)[JGW-L1910057]https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10057
No. 3 (2018/12)[JGW-M1809350]https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=9350
No. 2 (2018/8)[JGW-L1808559] https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=8559
No. 1 (2018/4)[JGW-L1808122] https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=8122

18